<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>排他思想</title>
</head>
<style>
  button{
    background-color: antiquewhite;
  }
</style>
<body>
  <button>按钮1</button>
  <button>按钮2</button>
  <button>按钮3</button>
  <button>按钮4</button>
  <button>按钮5</button>
  <button>按钮6</button>
</body>
<script>
  var btns = document.querySelectorAll('button')
  console.log(btns[1])
  console.log('1' + btns[1].style.backgroundColor)
  // 解决所有人
  for (var i = 0; i < btns.length; i++) {
    btns[i].onclick = function () {
      btns[i].style.backgroundColor = ''
    }
    this.style.backgroundColor = 'pink' 
  }
</script>

</html>